Finished openings in ASME Section VIII Div 1 2

[Derek57]

Hello,

I am sure this is a very simple question, but what does ASME mean when they reference a finished opening? I am analyzing a spherical pressure vessel which is over 3/8 in. thick and has a 10000 lb rated nozzle which is 2 inches in diameter. Section VIII Div 1 UG-36 mentions exclusions for finished nozzles under 2.375 inches in diameter, but the "finished openings" section throws me off a bit.

Thanks in advance for any help (just started my first ME position and I so not yet have a mastery over all the jargon!)

 

[jamesl]

If the nozzle is inserted into the wall, the finished opening is the ID of the 2" nozzle.

 

[trottiey]

The finished opening is diameter 'd' in UG-40. Spend some time staring at Figure UG-40. Basically if your weld is strong enough, your finished opening is the ID of your nozzle. But if you go cheap on the weld, then your finished opening is the ID of the hole or socket that you cut in the shell, i.e. slightly more than the OD of your nozzle.